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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cc8d5ebec0748cd0b5656d230fdeba8600f76a2f3d06f17d9a539335985de8' 
  AND token = 'OHHnOxSR2SPTFvmid2ul4/10S81wC1osTee0n6zKmOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}